After
the power stroke has occurred during skeletal muscle contraction, what
must occur in order for the myosin-actin cross-bridge to be released?
A)Troponin must bind with tropomyosin.B)ATP must bind with the myosin head.
C)Myosin must be dephosphorylated.
D)Calcium must bind with myosin.
E)ATP must be cleaved.

B)ATP must bind with the myosin head.

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The
principle that states the force of contraction is dependent on the
degree of stretch or contraction prior to stimulation is the
A)muscle tone.
B)summation principle.
C)sliding filament theory.D)length-tension relationship.

D)length-tension relationship.

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Calcium is released from the sarcoplasmic reticulum when an action potential
opens gated ion channels located in the ________________.
A)myoglobin
B)sarcolemmaC)T tubules
D)myofilaments

C)T tubules

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The time lapse between the beginning of stimulus and the beginning of a twitch is called the
A)relaxation phase.
B)contraction phase.C)latent period.
D)refractory period.

C)latent period.

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If you attempt to lift a heavy object but it doesn't move, what type of contraction have you performed?
A)concentricB)isometric
C)isotonic
D)eccentric

B)isometric

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The
phenomenon occurring when the tension of muscle twitches progressively
increase as the frequency of stimulus increases is known as
A)tetany.
B)threshold.
C)graded response.D)treppe.

D)treppe.

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Which of the following statements about slow-twitch muscle fibers is false?
A)Slow-twitch muscle fibers are fatigue resistant.B)Slow-twitch muscle fibers are anaerobic.
C)Slow-twitch muscle fibers are smaller than fast-twitch fibers.
D)Slow-twitch muscle fibers have abundant mitochondrion and myoglobin.

B)Slow-twitch muscle fibers are anaerobic.

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Fatigue can be caused by all of the following except
A)low pH in sarcoplasm.
B)excess of lactic acid.
C)low acetylcholine supplies.D)excess of myoglobin.